Extruders



G. 8. BROWN April 3, 1956 EXTRUDERS 2 Sheets-Sheet l INVENTOR. G. 8. BROWN m n? ET 2 Filed Aug. 7, 1951 ATTORNEY April 3, 1956 e. s. BROWN 2,740,158

EXTRUDERS Filed Aug. 7, 1951 2 Sheets-Sheet 2 INVENTOR. G. S. B R OW N ATTORNEY United States Patent @fifice 2,740,158 Patented Apr. 3, 1956 EXTRUDERS Grant S. Brown, Downers Grove, 1 11., assignor to Western Electric Company, Incorporated, New York, N. Y., a cor oration or New York Application August 7, 1951, Serial No. 240,694 '10 Claims. (31. 18- 13 This invention relates to e'Xtruder's, and more particularly to tool holders for extruding head's.

In the extrusion of insulating ahd jacke't'ing compounds in the form of coverings on filaments, such as, to'r example, conductors and cable cores, thecore usually is advanced through a core tube removably mounted in an extruding head of an extruder, and a die also removably mounted in the extruding head and the compound 'is forced between the die and the core tube to form the covering. Core tubes and dies of difie'reht sizes are used with the same extruder to cover cores of different sizes. With the apparatus of the prior art, it has been difficult to change or clean dies and core tubes in an extrude'r without considerable loss of time.

An object of the invention is to provide new and-improved extruders.

A further object of the invention is to provide new and improved tool holders for extruders.

Another object of the invention is to provide quickdetachable core tubes and dies and holding 'elemehts therefor.

An extruder illustrating certain features of the invention may include an extruding head having aligned sockets therein, a die designed to fit into one of the sockets, a die designed to fit into the other socket, quick-detachable means for locking the die in the socket into which it fits and quick-detachable means for locking thecore tube in the other socket.

A complete understanding obtained from the following apparatus forming a specific read in conjunction with which Fig. 1 is a fragmentary, horizontal section of an appar atus forming one embodiment of the invention;

Fig. 2 is a vertical section taken along line 2 -2 of Fig. 1;

Fig. 3 is a vertical section taken along line 3 3 of Fig. 1; 1

Fig. 4 is a vertical section taken along line 44 of Fig. 1, and

Fig. 5 is an explodedperspective view of a portion of the apparatus shown in Fig. l.

Referring now in detail to the drawings, there is shown therein an extruding head 8 fitting on an extruding cylinder 9 and having a quick-detachable tapered die 10 and a quick-detachable core tube '12. has a tapered flow passage and a tapered socket 16, fits loosely in a socket 17 in'the head, and may be adjusted by adjustment screws 18 and adjustment screws 19 carryi-ng dial gauges 20. Heating elements 21 are inou'nted in the die holder with conductors 22 leading from the heating elements along an annular groove 24. An outer locking ring 26, threaded into a tapped portion 28 of the socket 17 in the extruding head, hasspaced cam lugs 29. Cam lugs 30, formed on-an inner lo'cking'rihg 3'1, engage the cam lugs 29 to hold the tapered 'die 10 firmly in the tapered socket 16, the two rings forming a breech-type of the invention may be detailed description of an embodiment thereof, when the appended drawings, in

A die holder 14, which 2 look. The ring 31 may be turned to move the lugs 30 out of engagement with the lugs 9, and the ring 31 removed, the lugs '30 moving freely between the lugs 29 as the die '10 is pulled out of the extruding head.

A core tube holder 34 is mounted rigidly in a passage 32 in the extrusion head 8 by a splining pin 33 fitting in a slot 27 and a cap 35 threaded on a boss 36 of the head to hold a collar 37 threaded on the holder 34 against the end of the boss. To remove the core tube 12 from the holder 34, a cam "sleeve, 38, having end flanges 39 and 40 and cam slots 43, is turned in a stationary tube 41 to push a draw tube 45 to the right by meansof followers 46, splining the core tube holder 34 to the tube 41. The followers 46 are slidable along longitudinal slots 47 in the tube 41. This pushes a tapered shoulder '54 on the tube 12 away from a tapered socket 52 formed in the core tube holder 34 by means of an annular shoulder 55 on a locking sleeve 56 pushing against arcuate lugs 58 formed on a shank 59 of the core tube. The core tube may then be turned to move the lugs 58 away from lugs 60 on the locking sleeve 5'6 to openings '61 therebetween and withdrawn from the locking ring and the extruding head. A pin '62.projectin"g radially from the tip 12 engages one of the lugs 60 to align the lugs 58 with the lugs 60 when the core tube is assembled with the core tube holder 34 prior to the actuation of the draw tube 45 to pull the core tube tight against the tube holder. The core tube may be released by the operator and held solely by the draw tube as the draw tube is pulled to the left to seat the core holder tube. The juncture of the core tube and the core tube holder is positioned at the small end of the tapered passage 1-5 rather than farther into the extrusion head to facilitate cleaning plastic material off the end of the core tube holder and the core tube, in preparing to remove the core tube from the extruding head.

A pipe leading to exhaust means (not shown) fits into a socket 71 in a fitting 72 rigidly connected to the core tube holder 34, and exhausts the core tube to draw a covering extruded between the die '10 and the core tube tightly onto a core advanced through the core tube and die. Holes 73 in the draw tube 45 form a passageway from the interior of the core tube to the interior of the core tube holder 34 for such exhausting.

The die holder 14 may be adjusted laterally of its-longitudinal axis by loosening the outer locking ring 26, me.- nipulating the adjustment screws 18 and 19, and retighttiming the outer locking ring. The dial gauges 20 show thepo'sition of the die, and their readings for the optimum position of each of various dies to be used in the extruder may be recorded to greatly facilitate setting-up operations. The taper of the die and the taper of the socket 1 6 in the die holder insure concentricity of the die and die holder. Similarly, the taper of the shoulder 52 of the core tube 12 and the taper of the socket 52 in the core tube holder precisely and uniformly locate the core tube in the extruding head 8 each time the core tube is seated in the socket. I

The core tube 12 and the die 10 may be removed and replaced with another core tube and die in a very short time even though the core 'tube and die may be so hot as they are removed that they can be held and manipulated by a gloved operator only a few seconds at a time. Thus, for such substitutions, the extruder need be shut down only a few minutes.

Certain features of the above-described extruder are disclosed and claimed in co-p'ending application Serial No. 240,643, filed August 7, 1951, by H. A. Myers for Extruders. I

his to be understood that the above-describedarrangements are simply illustrative of the application of the principles of the invention. Numerous other arrangements 'may be readily devised by'those skilled in "the "an 2 U which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is:

1. An extruder, which comprises an extruding head having a passage therethrough, a tubular core tube holder having a socket formed in the end thereof mounted in one of the arms of the passage, a core tube having a shank portion provided with lugs projecting outwardly therefrom designed to seat in said socket, a tubular core tube lock provided with inwardly projecting lugs for engaging the lugs of the core tube, and means operable exteriorly of the extruding head, said inwardly projecting lugs and outwardly projecting lugs being so spaced that the outwardly projecting lugs may move freely between the inwardly projecting lugs in one position of the core tube and the outwardly projecting lugs engage the inwardly projecting lugs when the core tube is turned on its axis to a second position for pulling the core tube lock along the core tube holder to seat the core tube in the socket in the core tube holder.

2.. An extruder, which comprises an extruding head having a passage therethrough, a tubular core tube holder having a tapered socket formed in the end thereof mounted in the passage, a core tube having a shank portion provided with lugs projecting outwardly therefrom and a tapered shoulder designed to fit into said socket, a tubular core tube lock provided with inwardly projecting lugs for locking over the lugs of the core tube, and means for pulling the core tube lock along the core tube holder to seat the tapered shoulder of the core tube in the socket in the core tube holder, said lock also being provided with projecting means for engaging the end of the core tube to push it away from the core tube holder.

3. An extruder, which comprises an extruding head having a passage therethrough, a tubular core tube holder having a socket formed in the end thereof mounted in the passage, a core tube having a shank portion provided with lugs projecting outwardly therefrom designed to fit into said socket, a tubular core tube lock provided with a shoulder and lugs forming an inner annular groove for receiving the lugs of the core tube, and means for pulling the core tube lock along the core tube holder to seat the core tube in the socket in the core tube holder and for pushing the core tube lock to move the core tube away from the core tube holder.

4. An extruder, which comprises an extruding head having a passage therethrough, a tubular core tube holder having a socket formed in the end thereof mounted in the passage, is core tube having a shank portion provided with lugs projecting outwardly therefrom and a shoulder designed to seat in said socket, a tubular core tube lock provided with inwardly projecting lugs for engaging the lugs of the core tube, means for pulling the core tube lock along the core tube holder to seat the core tube in the socket in the core tube holder, said head being provided with a second socket, and a die designed to fit into said second socket, and quick-detachable means for locking the die in said second socket.

5. An extruder, which comprises an extruding head having a passage therethrough, a die mounted in one end of the passage, a tubular core tube holder locked in the other end of the passage, said holder having a tapered socket therein, a core tube having a tapered portion complementary to the tapered socket and also being provided with a shank having lugs projecting outwardly therefrom and spaced therearound, said lugs being substantially smaller than the interior of the core tube holder, a latching tube having an interior annular groove and spaced openings from the end to the groove to permit the lugs on the core tube to enter the groove, said latching tube being mounted slidably in the core tube holder, the portions of the latching tube between said openings being lugs for preventing withdrawal of the core tube when the lugs on the core tube are aligned with the lugs on the latching tube, means for preventing turning movement of the latching tube relative to the core tube holder, and means rotatable about thelongitudinal axis of thecore tube holder for pulling the latching tube along the core tube holder in a direction such as to seat the core tube in the socket in the core tube holder,

6. An extruder, which comprises an extruding head having a passage therethrough, a die mounted in one end of the passage, a core tube holder locked in the other end of the passage, said holder having a socket provided with a tapered mouth portion, a core tube having a shank provided with a portion complementary to the socket and also being provided with a reduced end portion having lugs projecting outwardly therefrom and spaced therearound, a latching tube having an interior annular groove and spaced openings to permit the lugs on the core tube to enter the groove, said latching tube being slidable in the core tube holder, the portions of the latching tube between said openings being lugs for preventing with-. drawal of the core tube when the lugs on the core tube are aligned with the lugs on the latching tube, means for preventing turning movement of the latching tube relative to the core tube holder, and means for pulling the latching tube along the core tube holder in a direction such as to seat the core tube in the socket in the core tube holder and for pushing the latching tube in the opposite direction to push the core tube at least partially out of the socket in the core tube holder.

7. An extruder, which comprises an extruding head having a socket of a predetermined diameter threaded at the mouth thereof and also provided with tapped bores extending radially from the exterior thereof to the socket, a die holder having a cylindrical outer portion of a diameter smaller than the diameter of the socket and also being provided with a tapered socket, a die having a tapered exterior designed to fit into the socket in the die holder, a plurality of adjustment screws threaded into the tapped bores in the head for locating the die holder in the socket in the head, an exteriorly threaded locking ring having inwardly projecting breech-lock lugs designed to' be screwed into the socket in the head to seat the die holder in the socket in the head, and a second looking ring having outwardly projecting breech-lock lugs for engaging the lugs of the first locking ring to lock the die in the die holder.

8.,An extruder, which comprises an extruding head having a socket of a predetermined diameter threaded at the mouth thereof and also provided with tapped bores extending radially from the exterior thereof to the socket, a die holder having a cylindrical outer portion of a diameter smaller than the diameter of the socket and also being provided with a tapered socket, a die having a tapered exterior designed to fit into the socket in the die holder, a plurality of opposed pairs of adjustment screws threaded into the tapped bores in the head for locating the die holder in the socket in the head, indicating means operable by one of each pair of adjustment screws for indicating the position of the die holder, an exteriorly threaded locking ring having inwardly projecting breechlock lugs designed to be screwed into the socket in the head to seat the die holder in the socket in the head, and a second locking ring having outwardly projecting breechlock lugs for engaging the lugs of the first locking ring to lock the die in the die holder.

9. An extruder, which comprises an extruding head having an aligned core tube holder socket and a die socket therein, a die designed to fit into the die socket, a core tube holder fitting in the core tube holder socket having a core tube socket, a core tube designed to fit into the core tube socket, said die socket and said core tube beingof such dimensions that the core tube may be removed from the .head through the die socket, said core tube and said holder having interlockable radially extending projections, and means actuable while the core tube holder and the core tube are in the head for interlocking and unlocking the core tube and the core tube holder.

10. An extruder, which comprises an extruding head having a passage therethrough, a tubular core tube holder having a socket formed in one end thereof and a radially inwardly extending projection at that end thereof, a core tube having a shank portion provided with a radially outwardly extending projection designed to interlock with the core tube holder projection, said core tube shank portion being designed to fit into the socket in the core tube holder, and means operable while the core tube and the core tube holder are in the head for interlocking the core tube and core tube holder by said projections and unlocking the core tube and'core tube holder.

References Cited in the file of this patent UNITED STATES PATENTS Shaw et al Dec. 11,

Smith Oct. 26,

Hallam et al Apr. 24,

Richardson et al. July 17,

Galloway Nov. 13,

FOREIGN PATENTS Great Britain Sept. 27, 

